Dan was running, and he tripped and hurt his knee. The pain signals were carried to his brain by the:

A. sympathetic nervous system.

B. central nervous system.

C. endocrine system.

D. lobes of the brain.

How can 1 pair of rats add 5000 rats to a population in 1 year?

A hill is made of rock particles of different sizes. Which of these agents of erosion probably caused the hill to form? A. Glacialice B. Waves C. Wind D. Flowing water

Which of the following is true about a solute? A. It forms a suspension B. It dissolves a solvent C. It can't dissolve D. It is dissolved by a solvent

Which value is being measured in the columns labeled "Fraction remaining" and "Percentage remaining"? years of decay O quantity of energy O number of stable atoms O amount of material that has not decayed Hurry

1. The primary cause of oil in the ocean is the users not the producers. What does this statement mean? Explain (at least 5 sentences)

How would a houseplant respond to sunlight that comes from one direction? A. by curling its stem around its leaves B. by closing its leaves at night C. by growing roots downward through the soil D. by bending its stem toward the sun

Hershey and chase used a dna-based virus for their work. How might the results have been different if they had used an rna virus?

State the function of DNA

How are proteins involved in DNA replication?

Glucose is the primary fuel for cellular respiration. Which molecules can also be used by cellular respiration to generate atp?